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Instruments and methods of investigation


“Lost in Translation”: what do the negative values of effective Grüneisen coefficients mean in shock wave experiments? [Extended comment on “Shock compression of porous metals and silicates” by A B Medvedev and R F Trunin, Phys. Usp. 55 773 (2012)]


Institute for High Pressure Physics, Russian Academy of Sciences, Kaluzhskoe shosse 14, Troitsk, Moscow, 108840, Russian Federation

The possible reasons for the negative effective Grüneisen coefficient in silicates under shock compression are considered. It is shown that the negative effective values of the Grüneisen and thermal expansion coefficients are, as a rule, a consequence of diffuse structural changes with a change in the short-range order structure in the solid or liquid state. We discuss the thermodynamic and kinetic aspects of these transformations, as well as the possibility of chemical decomposition of compounds at high pressures and temperatures.

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Fulltext is also available at DOI: 10.3367/UFNe.0182.201208c.0847
PACS: 61.43.−j, 62.50.−p, 64.60.My, 65.60.+a, 91.35.−x, 91.40.Qa (all)
DOI: 10.3367/UFNe.0182.201208c.0847
URL: https://ufn.ru/en/articles/2012/8/c/
000310831300003
2-s2.0-84869001755
Citation: Brazhkin V V ""Lost in Translation": what do the negative values of effective Grüneisen coefficients mean in shock wave experiments? [Extended comment on "Shock compression of porous metals and silicates" by A B Medvedev and R F Trunin, Phys. Usp. 55 773 (2012)]" Phys. Usp. 55 790–795 (2012)
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Received: 3rd, April 2012, 3rd, April 2012

Оригинал: Бражкин В В «„Трудности перевода“: что означают отрицательные эффективные коэффициенты Грюнайзена в ударно-волновых экспериментах? (Развёрнутый комментарий к статье А.Б. Медведева и Р.Ф. Трунина „Ударное сжатие пористых металлов и силикатов“ [УФН 182 829 (2012)])» УФН 182 847–853 (2012); DOI: 10.3367/UFNr.0182.201208c.0847

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